Two words -- Clove Oil. I was mixing up some paint for my plein air pillboxes, and discovered the hard way that clove oil will eat right through the plexiglass finish. Actually, I should have known that. Last spring, I put a bit of clove oil in a little bitty plastic container. One day I opened my pochade and smelled clove oil. All that was left was the lid in a pile of wonderful-smelling goo. Apparently the lid was made of stronger stuff than the bottle itself.
So that brings me to my next question -- why are glass artists' palettes in large sizes so doggone expensive? I have this great new taboret and I would love to have a large glass palette to cover the top. The local big box stores don't carry glass of any size. Hmm. Any ideas out there?